Hello @satyakavala
The optimization of your application should be consulted with your website developer. Our plugin functionalities can only help in your effort to improve its performance.
We cannot go into details about each of the reported problems without having the URL of your website. If you are a SiteGround client you can open a Helpdesk request and we will provide a deeper analysis of what should be optimized in order to achieve better results when testing your website.
For the mentioned suggestions you should make sure to activate all of the SiteGround Optimizer enhancements through the plugin. More details on each of those can be found in this link:
The Frontend Optimization options will help improving the load times of your CSS and JavaScript files and reduce the initial server response time.
Best regards,
Georgi Ganchev
SiteGround.com